Teachers are professional persons. Professionalism implies that members of the pubic, in this case parents and children, bestow a trust and are entitled to expect that this trust will be exercised in an ethical manner.
Teachers in this position of trust are deemed to be in “loco parentis” and are expected to exercise a duty of care, which a careful and responsible parent would exercise in similar circumstances. The test that is applied to this duty of care is the test of reasonableness – what is reasonable to expect in any given set of circumstances.
For more information:
Teaching Council: Codes of Professional Conduct for Teachers
ASTI information leaflet Guidelines for Professional Behaviour for Teachers